The electron orbiting the proton in the hydrogen atom is at a distance of 
m. What is the magnitude of the electric force between the proton and the electron?
a. 
b. 
c. 
d. 
e. 
d.
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Scientists in the 1800s suggested that the source of the Sun's energy might be gravitational contraction. What was the major flaw of this hypothesis?
A) Contracting objects cool down rather than heat up. B) This process would power the Sun for only about 25 million years, but geologists already had evidence the Earth was much older than that. C) The Sun had been observed to be expanding, not contracting. D) The predicted amount of contraction should have been large enough for astronomers of that time to measure.
If you move twice as far away from a lawn mower running in an open field, the amplitude of the sound you hear will be ___________ what it was before
a. the same as b. twice c. half d. four times e. one fourth
A 5.00-g lead BB moving at 44.0 m/s penetrates a wood block and comes to rest inside the block. If half of its kinetic energy is absorbed by the BB,
what is the change in the temperature of the BB? The specific heat of lead is 128 J/kg ? K. A) 0.940 K B) 1.10 K C) 1.26 K D) 2.78 K E) 3.78 K
Revenue from a 10 MWe electrical power plant over 24 hours when electricity is sold at 7ยข/kwh will be about:
a. $1,700 b. $17,000 c. $34,000 d. $340,000 e. $700,000